6H-DIBENZ{8 b-e{9 THIEPIN DERIVATIVES

ABSTRACT

Disclosed are aminoalkyldibenzothiepines useful as medicaments, particularly as antihistaminics.

llnited States Patent Inventors Appl. No.

Priorities Ernst Jucker Ettlngen/Basel-Land;

Adolf J. Llndenmann, Basel; Fulvio Gadlent, Birsielden Basel-Land, all of Switzerland Dec. 19, 1962 Nov. 30, 1971 Sandoz Ltd.

Basel, Switzerland Dec. 21, 1961 Switzerland Apr. 11, 1962, Switzerland, No. 4431/62 61l-DlBENZ[B-E]THIEP1N DERIVATIVES 16 Claims, No Drawings u.s. Cl ..2 0/240 ,Tc. 260/2471, 260/268 TR, 260/293.4 n,

260/3265 SA, 260/3268], 260/327 B. 260/470. 260/516, 424/248. 424/250, 424/267, 424/274,

424/275 [5|] lnt.Cl C07d 67/00 [50] Field of Search 260/240. 327

[56] References Cited FOREIGN PATENTS 607,503 2/l962 Belgium 260/327 OTHER REFERENCES Protiva et al.,.Experientia, Vol l8 (7- l 5-62) pp. 326- 8.

Primary Examiner-lames A. Patten Anomey-lrwin Morton Aisenberg ABSTRACT: Disclosed are aminoalkyldibenzothiepines useful as medicaments, particularly as antihistaminics.

6H-DlBENZ[B-E]THIEPIN DERIVATIVES This invention relates to new heterocyclic compounds, acid addition salts thereof and pharmaceutical compositions containing the same.

The present invention provides 6H-dibenz[b,e]thiepin derivatives of the formula:

wherein R, is a member selected from the group consisting of halogen, lower alkyl, lower alkoxy and lower alkylthio, R, stands for hydrogen, R, represents a member selected from the group consisting of lower dialkylamino ethyl, piperidino ethyl, pyrrolidino ethyl, morpholino ethyl, 2-(piperidino)-l-. lower alkyl ethyl, and R and R together with the carbon atom to which they are joined represent l-lower alkyl-piperidylidene-(4); their acid addition salts with organic and inorganic acids and pharmaceutical compositions comprising, in addition to an inert carrier, a said compound and/or its acid addition salt in a therapeutically effective amount.

The aforesaid 6H-dibenz[b,e]thiepin derivatives of the formula l and their acid addition salts are prepared in that a llhydroxy-6H-dibenz[b,e ]thiepin derivative of the formula:

om-s wherein R,, R and R have the above significance, is treated with an agent for splitting off water and, when an acid addition salt is required, the resulting compound of the formula I is salified with an organic or inorganic acid.

The compound of formula IV may be produced by reacting a 6H-dibenz[b,e]thiepinl lone derivative of the formula:

oa s

wherein R, has the above significance, with a magnesium compound of the formula:

R: III

I ethyl chloride or l-methyl-pyrrolidyl-Z-ethyl chloride.

The formation of the Grignard reagent is preferably catalyzed by adding a small amount of ethylene bromide, ethyl bromide or methyl iodide and a trace of iodine. If desired the reaction mixture is heated under reflux to complete the reaction. The resulting Grignard reagent is then mixed with a 6H- dibenz[b,e]thiepin-l l-one of the formula ll, dissolved in the same solvent as is used for the Grignard reagent and the mixture stirred and heated to complete the reaction. The reaction mixture is subsequently hydrolyzed at ambient temperature with aqueous ammonium chloride solution and extracted with an organic solvent which is immiscible with water, preferably diethyl ether or benzene. The ll-hydroxy-6H-dibenz[ b,e]thiepin derivative of formula IV obtained as intermediate product may, if desired, be purified by chromatography or crystallization, or worked up further as such.

Water is split off, for example, by heating the compound IV in glacial acetic acid solution with concentrated hydrochloric acid. This operation can, however, also be effected with an other agent for spliting off water, e.g., phosphorus oxychloride, thionyl chloride or zinc chloride. The resulting 6H- dibenz[b,e]thiepin derivative of formula I is isolated and purified by known methods and, if desired, converted into an acid addition salt.

The compounds I are basic compounds which form relatively stable salts, crystalline at room temperature, with inorganic or organic acids, e.g. hydrochloric, hydrobromic, hydriodic,

' sulfuric, citric, tartaric, succinic, maleic, malic acetic, benzofore be used as medicaments.

The compounds of formula ll which are used as starting materials are new. The symbol R may signify a halogen atom, e.g., chlorine, bromine, iodine or fluorine, an alkyl, alkoxy, or an alkylthio radical, e.g., methyl, ethyl, propyl or isopropyl, methoxy, ethoxy, propoxy or isopropoxy, methylthio, or ethylthio radicals.

The starting materials may be produced in the following manner: A 2-halogeno-methyl-benzoic acid alkyl ester of the formula:

GH -Hal COOAlk in which l-lal represents a chlorine or bromine atom and Alk represents lower alkyl, is condensed by heating with a thiophenol derivative of the formula:

VI A in which R, has the above significance, in the presencefia low molecular weight aliphatic alcohol, e.g. ethanol, and the amount of sodium hydroxide calculated for the formation of the sodium salt to give a 2-(phenylthiomethyU-benzoic acid alkyl ester derivative and subsequently saponified to give the free acid of the formula:

wherein R has the above significance. Subsequent cyclization to give a cdmpound II can be carried out either using the free acid of formula VI] or a corresponding acid halide.

When using the free acid the cyclization procedure is as follows: The acid of formula Vll is added in portions to polyphosphoric acid (which may be obtained by mixing concentrated orthophosphoric acid and phosphorus pentoxide) at approximately 100 to approximately 200 C. in order to complete the cyclization, the reaction mixture is kept at the same temperature for several hours. After adding ice, the reaction mixture is extracted with benzene. The compound of formula II is isolated and purified by known methods.

Cyclization using an acid halide is carried out as follows: The free acid of formula VII is first reacted with a halogenating agent, e.g., thionyl chloride or thionyl bromide, and the resulting acid halide cyclized by heating with aluminum chloride in carbon disulfide or a chlorinated hydrocarbon, e.g., l,l ,2,2-tetrachloroethane.

In the following nonlimitative examples, all temperatures are stated in degrees Centigrade and the melting and boiling points are uncorrected.

VII

EXAMPLE 1 2-methyl-l l-[ l '-methyl-piperidylidene-(4')l-oH-dibenz [b,e] thiepin a. 2-methyl-l l-[ l '-methyl-piperidyl-(4')]-l l-hydroxy-6H- dibenz [b,e] thiepin 2.4 g. of iodine activated magnesium are covered with a little tetrahydrofuran and 0.1 cc. of ethylene bromide are added. When the reaction commences, a solution of 13.4 g. of lmethyl-4chloro-piperidine in 20 cc. of tetrahydrofuran is added dropwise at such a rate that the solvent boils. The reaction mixture is subsequently heated to boiling for 3 hours. A solution of I20 g. of 2-methyl-6H-dibenz [b,e] thiepin-l l-one in 40 cc. of tetrahydrofuran is then added over 45 minutes to this Grignard solution and it is then heated to boiling for 2 hours, while stirring. After cooling, the reaction mixture is poured into a solution of 45 g. of ammonium chloride in 300 cc. of water, diluted with 300 cc. of ether and filtered through highly purified diatomaceous earth. After separating the ethereal phase, the aqueous part is shaken out three times, each time with 300 cc. of ether. The united ethereal solutions are washed with water, dried over magnesium sulfate and evaporated. The oily residue is dissolved in 30 cc. of acetone, whereupon the 2-methyl-l l-[ l-methyl-piperidyl-(4')]-l lhydroxy-6H-dibenz [b,e] thiepin commences to crystallize. The compound, after recrystallizing from acetone, melts at 18 ll83.

b. 2-methyl-l l-[ l '-methyl-piperidylidene-(4')]-6H-dibenz [b,e] thiepin.

A solution of 3.0 g. of 2-methyl-l l-[ l '-methyl-piperidyl-(4 ')]-l l-hydroxy-oH-dibenz [b,e] thiepin in 30 cc. of glacial acetic acid is heated to boiling for 30 minutes with 12 cc. of concentrated hydrochloric acid and then evaporated at a pressure of 15 mm. Hg. The residue is made alkaline with 2N sodium hydroxide and shaken out three times, each time with 50 cc. of chlorofomi. Alter washing with water and drying over magnesium sulfate, the chloroform extract is evaporated to dryness and a solution of the residue in 20 cc. of ethanol saturated with gaseous hydrogen bromide, whereupon the 2- methyl-l l-[ l'-methyl-piperidylidene-(4')]-6H-dibenz [b,e] thiepin hydrobromide separates in crystalline form. After recrystallizing from ethanol, the hydrobromide melts at 294-297.

The 2-methyl-6H-dibenz [b,e] thiepin-l l-one, used as starting material, is produced as follows: 2-( p-tolylthiomethyl)-benzoic acid ethyl ester One hundred sixty five g. of 2-chloromethyl-benzoic acid ethyl ester (produced from o-toluic acid ethyl ester, sulphuryl chloride and dibenzoyl peroxide; b.p. -88/0.03 mm. Hg) are added dropwise to a solution of 104.0 g. of p-thiocresol (b.p. 75/l6 mm. Hg) and 33.4 g. of sodium hydroxide in l70 cc. of water and 635 cc. of ethanol. The mixture is heated to boiling under reflux for 1 hour. After cooling, the resulting sodium chloride precipitate is filtered and the filtrate reduced in volume in a vacuum of 12 mm. Hg. The residue is taken up in 800 cc. of chloroform, shaken with 160 cc. of ice-cold N sodium hydroxide solution, washed until neutral and dried over magnesium sulfate. After removing the chloroform and separating first runnings distilling at 13 mm. Hg, the resulting 2-(p-tolylthiomethyl)-benzoic acid ethyl ester is distilled at an air-bath temperature of l45-l50 under a pressure of 0.02 mm. Hg.

2-(p-tolylthiomethyl)-benzoic acid Four hundred sixty g. of 2-(p-tolylthiomethyl)-benzoic acid ethyl ester are heated to boiling for 75 minutes in a solution of 72.0 g. of sodium hydroxide in 510 cc. of water and 590 cc. of ethanol. The reaction solution is then reduced in volume at a pressure of 12 mm. Hg., diluted with 1,200 cc. of water and washed with 500 cc. of chloroform. The aqueous alkaline solution is acidified with 5N hydrochloric acid and extracted with 3,000 cc. chloroform. After washing the chloroform extract with water and drying over magnesium sulfate, it is reduced in volume to a certain extent and pentane is added. whereupon the resulting 2-(p-tobylthiomethyl)-benzoic acid is separated. After recrystallization from ethanol/pentane, the compound melts at l30-l 3 1.

2-methyl-6H-dibenz [b,e] thiepin-l l-one Three hundred g. of phosphorus pentoxide are added to 207 cc. of 85 percent phosphoric acid at 80-l00, while stirring well. The temperature is then maintained at One hundred five g. of 2-(p-tolylthiomethyl)-benzoic acid are added over l0 minutes to the resulting polyphosphoric acid and the reaction mixture is stirred for 75 minutes at l00. The mixture is then poured, while hot, on to 1 kg. of ice and diluted with 600 cc. of benzene. After filtering through highly purified diatomaceous earth, the benzene solution is separated and the aqueous phase shaken out twice, each time with 200 cc. of benzene. The united benzene extracts are extracted three times, each time with 100 cc. of 2N sodium hydroxide solution, washed until neutral with water and dried over magnesium sulfate. After removing the solvent in a vacuum, the solution of the crystalline residue in boiling ethanol is purified with animal charcoal and cooled, whereupon the resulting 2- methyl-oH-dibenz [b,e] thiepin-l l-one precipitates in crystalline form. After recrystallization from ethanol. the compound melts at l2l-l22.

EXAMPLE 2 2-methyl-l l-[ l '-dimethylaminopropylidene-(3')]-6H-dibenz [b,e] thiepin a. 2-methyl-l l-[ l '-dimethylaminopropyl-(3')]-l l-hydroxyoH-dibenz [b,e] thiepin 2.4 g. of iodine-activated magnesium are covered with a little tetrahydrofuran and 0.1 cc. of ethylene bromide added. When the reaction commences, a solution of l2.2 g. of 3- dimethylamino-l-propyl chloride in 20 cc. of tetrahydrofuran is added at such a rate that the solvent boils. The reaction mixture is then heated to boiling for 2 hours. A solution of 12.0 g.

of 2-methyl-6H-dibenz [b,e] thiepin-l l-one in 40 cc. of tetrahydrofuran is then added over a period of 30 minutes to this Grignard solution and stirred for a further minutes at this temperature. Further operations are as described in example la. After'purification with animal charcoal and recrystallization from acetone, the resulting 2-methyl-l l-[ l dimethylaminopropyl-( 3 ]-l lhydroxy-6l-l-dibenz [b,e] thiepin melts at l39-l42.

b. Z-methyl-l l-[ l '-dimethylaminopropylidene-( 3 ]-6H- dibenz [b,e] thiepin A solution of 4.0 g. of 2-methyl-l l-[ l -dimethylaminopropyl-(3')]-l l-hydroxy-Gl-l-dibenz [b,e] thiepin in 40 cc. of glacial acetic acid is heated to boiling for 1 hour with 16 cc. of concentrated hydrochloric acid. Further operations are as described in example lb. The resulting oily 2-methyl-l l-[ l'-dimethylamino-propylidene-(3')]-6H-dibenz [b,e] thiepin is reacted with ethanolic oxalic acid. After recrystallization from ethanol, the acid oxalate melts at l89-l92.

EXAMPLE 3 2-chloro-l l l '-methyl-piperidylidene-( 4' ]-6H-dibenz [b,e] thiepin a. 2-chloro-l l-[ l -methyl-piperidyl-(4' ]-l l-hydroxy-6H- dibenz [b,e] thiepin 2.4 g. of iodine activated magnesium are covered with a little tetrahydrofuran and 0.1 cc. of ethylene bromide added. When the reaction commences, a solution of 13.4 g. of lmethyl-4-chloro-piperidine in cc. tetrahydrofuran is added dropwise at such a rate that the solvent boils. The reaction mixture is then heated to boiling for 3 hours. A solution of 13.0 g. of 2-chloro-6H-dibenz [b,e] thiepin-l l-one in cc. tetrahydrofuran is added over 30 minutes at zero degrees to this Grignard solution and then stirred for a further 30 minutes at the same temperature. Further operations are as described in example 4a. After purification with animal charcoal and recrystallization from acetone, the resulting 2-chloro-l l-[lmethyl-piperidyl-(4 ]-l l-hydroxy-H-dibenz [b,e] thiepin melts at l 82-184.

b. 2-chloro-l l-[ l '-methyl-piperidylidene-(4')]-6H-dibenz [b,e] thiepin A solution of 6.0 g. of 2-chloro-l l-[ 1 -methyl-piperidyl-(4 )]-l l-hydroxy-6H-dibenz [b,e] thiepin in 60 cc. of glacial acetic acid is heated to boiling for 1 hour with 18 cc. of concentrated hydrochloric acid. Further operations are as described in example lb. After recrystallization from acetone, the resulting 2-chloro-l l-[ l '-methyl-piperidylidene-(4' )]-6l-ldibenz [b,e] thiepin melts at l6ll64.

The 2-chloro-6H-dibenz [b,e] thiepin-l l-one, used as starting material, is produced as follows: 2-(p-chlorophenylthiomethyl)-benzoic acid ethyl ester One hundred twenty g. of 2-chloromethyl-benzoic acid ethyl ester (b.p. 8588/0.03 mm. Hg.) are added dropwise to a solution of 88.0 g. of p-chlorothiophenol, 24.3 g. of sodium hydroxide in 145 cc. of water and 540 cc. of ethanol. The mixture is heated to boiling under reflux for 75 minutes. Further operations are as described in example lb. (Production of starting material). The 2-(p-chlorophenylthiomethyl)-benzoic acid ethyl ester distils at l76178 under a pressure of 0.l

mm. Hg. 2-(p-chlorophenylthiomethyl)-benzoic acid One hundred thirty-nine g. of 2-(p-chlorophen ylthiomethyl)-benzoic acid ethyl ester are heated to boiling for 1 hour in a solution of 21.0 g. of sodium hydroxide in 125 cc. of water and 105 cc. of ethanol. Further operations are as described in example 1b. (Production of starting material). After recrystallization from chloroform/pentane, the acid melts at l34-l 35. 2-chloro-6H-dibenz [b,e] thiepin-1 l-one Cyclization of 2-(p-chlorophenylthiomethyl)-benzoic acid with polyphosphoric acid is effected in a manner analogous to that described in example lb. (Production of starting material). After recrystallization from ethanol, the compound melts at l34-l36.

Cyclization may also be carried out with aluminum chloride in l, l ,2,2-tetrachloroethane. The following procedure is used: 48.5 g. of 2-(p-chlorophenylthiomethyl)-benzoyl chloride [b.p. l78-l80/0.l mm. Hg; produced from 2-(pchlorophenylthiomethyl)-benzoic acid and thionyl chloride] in 250 cc. of l,l,2,2-tetrachloroethane are added dropwise to 57.0 g. of aluminum chloride in 320 cc. of l,l,2,2- tetrachloroethane over a period of 1% hours at and stirred for 24 hours at the same temperature. The solvent is then removed by vacuum distillation, 500 cc. of benzene are added to the residue and, while cooling, 500 g. of ice with 80 cc. of concentrated hydrochloric acid added. The benzene solution is separated and the aqueous phase shaken out with a further 200 cc. of benzene. The united benzene extracts are shaken out twice, each time with 100 cc. of 2N sodium hydroxide and washed until neutral with water. After drying over magnesium sulfate, the benzene is distilled away. The crude produce is purifled by boiling in ethanol with animal charcoal, filtered through highly purified diatomaceous earth and the filtrate reduced in volume to a certain extent, whereupon the resulting 2-chloro-6H-dibenz [b,e] thiepin-l lone separates. After recrystallization from ethanol, the compound melts at l34-l36.

EXAMPLE 4 2-chl0ro-l l-[ l '-dimethylaminopropylidene-( 3 ]-6H-dibenz [b,e] thiepin a. 2-chlorol l-[ l '-dimethylaminopropyl-( 3 )]-l l-hydroxy- 6H-dibenz [b,e] thiepin The desired compound is obtained in the same manner as described in example la, from B-dimethylamino-l-propyl chloride and 2-chloro-6H-dibenz [b,e] thiepin-l l-one by Grignardization and subsequent hydrolysis. After purification with animal charcoal and recrystallization from ethanol/pentane the resulting 2-chloro-ll-[l-dimethylamino-propyl-(3 ')]-l l-hydroxy-H-dibenz [b,e] thiepin melts at l54l55.

b. 2-chloro-l l-[ l '-dimethylaminopropylidene-( 3 ]-6H- dibenz [b,e] thiepin A solution of 5.0 g. of 2-chloro-l l-[l'-dimethylaminopropyl-(3')]-l l-hydroxy-oH-dibenz [b,e] thiepin in 50 cc. of glacial acetic acid is heated to boiling with 20 cc. of concentrated hydrochloric acid for 1 hour. Further operations are as described in example lb. The 2-chloro-l l-[ l dimethylaminopropylidene-(3)]-6H-dibenz [b,e] thiepin obtained as an oil is reacted with ethanolic oxalic acid. After recrystallization from ethanol, the acid oxalate melts at 2l5-2l6.

EXAMPLE 5 2-chloro-l l-[1-piperidinopropylidene-(3')]-6H-dibenz [b,e] thiepin a. 2-chloro-l l-[ l 'piperidinopropyl-( 3 ]-l l-hydroxy-GH- dibenz [b,e] thiepin in the same manner as described in example la, the desired compound is obtained from piperidinopropyl chloride and 2- chloro-6H-dibenz [b,e] thiepin-l l-one by Grignardization and subsequent hydrolysis. After purification with animal charcoal and recrystallization from ethanol, the resulting 2- chlorol l-[ l '-piperidinopropyl-( 3 l l-hydroxy-oH-dibenz [b,e] thiepin melts at l-l97.

b. 2-chloro-l l-[ l'-piperidinopropylidene-( 3 ]-6l-l-dibenz [b,e] thiepin A solution of 4.0 g. of 2chlorol l-[ l '-piperidinopropyl-(3 )]-l l-hydroxy-GH-dibenz [b,e] thiepin in 40 cc. of glacial acetic acid is heated to boiling for 1 hour with 16 cc. of concentrated hydrochloric acid. Further operations are as described in example lb. After purification with animal charcoal, the resulting 2-chloro-l l-[l'-piperidinopropylidene-(3 ')]-6H-dibenz [b,e] thiepin, which forms an oil, is converted into the acid fumarate with ethanolic fumaric acid. After recrystallizing from ethanol, the acid fumarate melts at 240245.

EXAMPLE 6 2-chloro-l 1- B-[ l'-methyl-piperidyl-(2' )-ethylidene] -6H- dibenz[b,e]thiepin in the same way as described in example 1, the desired compound is obtained as an oil from I-[ l '-methyl-piperidyl-(2)]- 2-chloroethane and 2-chloro-6H-dibenz[b,e]thiepin-1 l-one, by Grignardization and subsequent hydrolysis. This is purified chromatographically on aluminum oxide and eluted with benzene.

b. 2-chloro-1 l- ,B-[ l '-methyl-piperidyl-(2)-ethylidene] 6H-dibenz[b,e]thiepin.

Water is split off from the l l-hydroxy compound in a manner similar to that described in example lb. After working up, a solution of the resulting residue in 20 cc. ethanol is saturated with gaseous hydrogen bromide, whereupon the 2- chloro-l 1- B-[ l'-methyl-pipen'dyl-(2' )-ethylidene] -6H- dibenz[b,e]thiepin hydrobromide separates in crystalline form. After recrystallization from ethanol, the hydrobromide melts at 245260.

EXAMPLE 7 Z-methylthio-l l-[ l'-dimethylaminopropylidene-( 3 ]-6H dibenz[b,e]thiepin a. 2-methylthio-l l-[ l'-dimethylaminopropyl-(3)]-l lhydroxy-6H-dibenzlb,e]thiepin in the same way as described in example la, the desired compound is obtained from 3-dimethylamino-l-propyl chloride and Z-methylthio-GH-dibenz [b,e] thiepin-l l-one by Grignardization and subsequent hydrolysis. The resulting 2- methylthio-l l-[ l -dimethylaminopropyl-(3')]-l l-hydroxyoH-dibenz [b,e] thiepin melts at l37-l38 on recrystallizing from acetone,

b. 2-methylthio-l l-[ l '-dimethylaminopropylidene-(3')]-6 H-dibenz [b,e] thiepin A solution of 4.0 g. of 2-methylthio-l l-[ ldimethylaminopropyl-(3)]-l l-hydroxy-H-dibenz [b,e] thiepin in 40 cc. of glacial acetic acid is heated to boiling for 1 hour with 16 cc. of concentrated hydrochloric acid. Subsequent operations are as described in example lb. The resulting Z-methylthio-l l-[ l '-dimethylaminopropylidine-(3')]-6H- dibenz [b,e] thiepin forms an oil; this is converted into the acid oxalate with ethanolic oxalic acid. After recrystallization from ethanol, the compound melts at l80-l 85.

The Z-methylthio-6H-dibenz [b,e] thiepin-l l-one which is used as starting material is produced as follows: 2-(p-methylthio-phenylthiomethyl)-benzoic acid ethyl ester 39.7 g. of 2-chloromethyl-benzoic acid ethyl ester are added dropwise to a solution of 31.2 g. of p-methylthio-thiophenol (b.p. l35/l3 mm. Hg.), 8.0 g. of sodium hydroxide in 40 cc. of water and 150 cc. of ethanol. The mixture is heated to boiling for 1 hour under reflux. Subsequent operations are as described in example lb, (Preparation of starting material). The compound distills at an air-bath temperature of l60, under a pressure of0.0l mm. Hg. 2-(p-methylthio-phenylthiomethyl )-benzoic acid M.p. l35-l37 from ethanol/pentane produced in a manner analogous to that described in example lb, (Production of starting material) from the corresponding ethyl ester. 2-methylthio-6H-dibenz [b,e] thiepin-l l-one One hundred g. of 2-( p-methylthiophenylthiomethyl)- benzoic acid are added to a mixture of 285 g. of phosphorus pentoxide and 190 cc. of 85 percent phosphoric acid in 2,000 cc. of toluene, while stirring vigorously and at the boiling temperature under reflux. Further operations are as described in example lb, (Production of initial material). M.p. 92-94 from ethanol.

EXAMPLE 8 a. Z-methylthio-l l-[ l -methyl-piperidyl-(4)]-l l-hydroxy- 6H-dibenz [b,e] thiepin As described in example la, the desired compound is obtained from l-methyl-4-chloro-piperidine and Z-methylthio- 6H-dibenz [b,e] thiepin-l l-one by Grignardization and subsequent hydrolysis. The resulting 2-methylthio-l l-[ l -methylpiperidyl-(4')]-l 1-hydroxy-6H-dibenz [b,e] thiepin, on crystallization from acetone, melts at 178l b. Z-methylthio-l l-[ l '-methyl-piperidylidene-(4')]-6H- dibenz[b,e] thiepin Water is split off from the ll-hydroxy compound in a manner analogous to that described in example lb. The resulting 2-methylthio-l l-[ l -methyl-piperidylidene-(4')]-6H- dibenz [b,e] thiepin, which forms an oil, is triturated with pentane, whereupon the compound crystallizes. M.p. l54l55.

EXAMPLE 9 2-methoxy-l l-[ l '-dimethylaminopropylidene-( 3 ]-6H- dibenz [b,e] thiepin a. 2-methoxy-l l-[ l '-dimethylaminopropyl-(3)]-l lhydroxy-6H-dibenz [b,e] thiepin As described in example la, the desired compound is obtained from 3-dimethylamino-l-propyl chloride and 2- methoxy-GH-dibenz [b,e] thiepin-l l-one by Grignardization and subsequent hydrolysis. M.p. l 23125 from acetone.

b. 2-methoxy-l l-[ l'-dimethylaminopropylidene-( 3 ]-6H- dibenz [b,e] thiepin Water is split off from the l l-hydroxy compound in a manner analogous to that described in example 1b. The resulting 2-methoxy-l 1-[ l -dimethylaminopropylidene-(3')]-6H- dibenz[b,e] thiepin, which forms an oil, is converted into the acid oxalate with ethanolic oxalic acid. After recrystallization from ethanol, the acid oxalate melts at l87-l 89.

The 2-methoxy-6H-dibenz [b,e] thiepin-l l-one, which is used as starting material, is produced as follows: 2-(p-methoxyphenyl-thiomethyl )-benzoid acid ethyl ester 39.7 g. of 2-chloromethyl-benzoic acid ethyl ester are added dropwise to a solution of 28.0 g. of p-methoxy-thiophenol (b.p. l05/l4 mm. Hg.), 8.0 g. of sodium hydroxide in 40 cc. of water and 150 cc. of ethanol. The mixture is heated to boiling for 1 hour under reflux; further operations are described in example lb. (Preparation of starting material). The compound distills at l75-180, under a pressure of 0.05 mm. Hg. 2-(p-methoxyphenyl-thiomethyl )-benzoic acid M.p. l24-126 from ethanol/pentane produced from the corresponding ethyl ester in a manner analogous to that described in example lb. (Preparation of starting material). 2-methoxy-6H-dibenz [b,3] thiepin-l l-one One hundred g. of 2-(p-methoxyphenylthiomethyl) benzoic acid are added to a mixture of 300 g. of phosphorus pentoxide and 200 cc. of percent phosphoric acid in 2,000 cc. of toluene, while stirring vigorously at the boiling temperature under reflux. Further operations are as described in example 1b. (Preparation of starting material). M.P. 94-96, after recrystallization from ethanol.

EXAMPLE l0 Z-methoxy-l l-[ l '-methyl-piperidylidene-(4')]-6H-dibenz [b,e] thiepin a. 2-methoxy-l l-[ l '-methyl-piperidyl-(4)]-l l-hydroxy- 6H-dibenz [b,e] thiepin As described in example la, the desired compound is obtained from l-methyl-4-chloro-piperidine and 2-methoxy-6H- dibenz [b,e] thiepin-l l-one by Grignardization and subsequent hydrolysis. M.p. l82-l 85 from acetone.

b. 2-methoxy-l 1-[ l -methyl-piperidyiidene-(4)]6H-dibenz [b,e] thiepin Water is split off from the ll-hydroxy compound in a manner analogous to that described in example lb. The resulting Z-methoxy-l 1 l '-methyl-piperidylidene-(4)]-6H-dibenz [b,e] thiepin forms an oil. Pentane is added, whereupon the compound crystallizes. M.p. l 20l 21.

added at such a rate that the solvent boils. The reaction mix ture is subsequently heated to boiling for 1 hour. A solution of 20.0 g. of 2-chloro6H-dibenz [b,e] thiepin-l l-one (m.p. l34-l 36) in 60 cc. of tetrahydrofuran is then added at zero dibenz [b'e] thiepin 5 degrees over a period of IS minutes, and the mixture stirred a. Z-methoxy-{B-l l :methyl-prperrdyl-(Z' )-e hy ifor 30 minutes, at the same temperature. The reaction mixture hydroxy'isiil'dlbenz ib'ei thiepin is then poured into a solution of 135 g. of ammonium chloride f described m example. iagme desired compound is in 400 cc. of water, diluted with 300 cc. of ether and filtered mined from H y 'p p y i' and through high-purity diatomaceous earth. After separation of zmethoxy'isfl'dibenzibgeithiepin'i iohe by Gi'ighai'dizaiion the ethereal phase, the aqueous portion is shaken out with a and subsequent hydrolysis f' i from h further 200 cc. of ether, the united ethereal solutions washed zfmethoxy'l f f l "methylpipendyi(zli'ethyhdeneii with water, dried over magnesium sulfate and evaporated. 30 i thiepin cc. of ethanol are added to the oily residue. whereupon the 2- Water is splrt ofi' from the l l-hydroxy compound in a chkmm HI I |id 2' h H hydmxy manner analogous to that described in example After oH-dibenz [b,e] thiepin commences to crystallize. The com working p! i0 of eihahoi which is Saturated with gaseous pound melts at l30-l 32 after recrystallization from ethanol. hydrogen chloride are added to a solution of the resultant 2 ,U 1' 2' id y. residue in ID cc. ethanol. The solution is reduced in volume to 6H dibem [[3,6] thiepin a certain extent. whereupon the Z- y- -lB-l y A solution of 4.0 g. of 2-chloro-l 1; l '-methyl-pyrrolidylp p idy y ]ll thiepin (2')-ethyl] }-1 l-hydroxy-6H-dibenz [b.e] thiepin in 40 cc. of hydrochloride Precipiiaies ih crysiaiiihe fomi- After glacial acetic acid is heated with 16 cc. of concentrated iizaiioh from ethahOi/eiher. the hydrochloride meiis at hydrochloric acid for l hour to boiling. The solvent is then 204L2i removed under a pressure of 15 mm. Hg., the residue made alkaline with 2N sodium hydroxide and shaken with three 100 cc. portions of ether. After washing the ether extract with EXAMPLE 12 water and drying over magnesium sulfate, the solvent is removed and the oily residue of 2-chloro-l l-(B-[l'-methylpyrrolidyl-(2')-ethylidene]}-6H-dibenz [b,e] thiepin reacted -i l -l y -pyr y y n ll with the calculated amount of ethanolic oxalic acid. The acid l fil thiepin oxalate melts at l-l 87 after recrystallization from a. 2-chloro-l l-{ B-[ l 'methyl-pyrrolidyl-(Z' )-ethyl]} -l 1- ethanol, hydroxy-6H-dibenz [b,e] thiepin The production of the starting material, 2-chloro-6H-dibenz 4.2 g. of iodine activated magnesium are covered with a lit- [b,e] thiepin-l l-one is described in example 3. tle tetrahydrofuran and 0.15 cc. of ethylene bromide added. 35 The remaining examples l3-20 are summarized in the fol- When the reaction starts, a solution of 24.7 g. of l-[ 1 -methyllowing table; in all these examples, the procedure is analogous pyrrolidyl-(2' )l-Z-chloroethane in 25 cc. of tetrahydrofuran is to that of the example 12.

TABLE I IE3. Compounds of Formula. I Intermediates of Formula IV Starting materials Acid Iumarate. nap. 13D135 from ethanoL Acid oxalate. m.p. 21l-2i5 from acetone"...

M.P. 163l65 from acetone.

l-methyl-pipcridyl-(3)-chloromethane.

M.P. 134-136 from ethanol.

M.P. 134-136 from ethanol.

1-pipen'dino-2- methyl-B-chloropropane l-methyl-piperithiepin-ll-onc.

methane. Acid iurnarate. m.p. 215220. M.P. 157162 from ethanol/pentane. M.P. 121l22 from ethanol.

16... Z-methyl-ll-lfl-[Y-methyl-piperidyl-(2')- 2-methyl-11-lB-[Y-rnethyl-piperld l-(2)- 1-[1-methyl- 2methy1-6H-dibenz[b,e]-

cthylidene]{-6H-dibenz[b,e]thiepin. ethyl]l-11-hydroxy'6H-dibenz[b,c thiepin. gipkelridylt-gflthiepin-li-ene.

. -c oroe ane. Hydrobrornide. m.p. 219-225 from acetone. M.P. 188-191 from acetone. M.P. 121122 from ethanol.

17... 2-methy1-11-lB-[1-methyl-pyrrolidyl-(2)- 2-meth l-ll-lfl-[Y-meth l-pryrolidyl-(2)- 1-[1-methyl- 2-methyl-6H-dibenz[b,el-

ethylidene]l-6H-dibenz[b,e]thiepin. ethyl l-ll-hydroxy-fi -dibenzlb,e]thiepin. gyrfiplidyll-lflfithiepin-ii-one.

-c oroet ane.

Acid oxalate. In.p. -175 from ethanol.

M.P. 138-145 from ethanol.

i-methyl-piperthiepin-ll-one.

methane. Acid lumaratc. rn.p. 200-207 from ethanol. M.P. 180 from ethanol. M.P. 94-96 from ethanol.

19"... 2-methy1thio-li-lB-[V-methyl-piperidyl- Zinethylthlo-ll-lB-[1methyl-piperidyl-(2)- i-[1-methyl- Q-methylthio-GH-dibenz- (2)-ethylidcne] (-6H-dibenz[b,e}thiepiu. ethyl] l-11-hydroxy-6H-dibenz[b,elthlepin. pipkllalridylggfl- [b,e]thiepin11one.

2-c oroe ane.

l-Iydrobromlde. rn.p. 260-264".

M.P. 92-94" from ethanol.

l-rnorpholino-2- methyl-3chloropropane.

epln. Acid lumarate. nr.p. led-160 from ethanol. M.P. l84-l90 from acetone. M.P. 9294 from ethano i Production, Example 3. Production, Example 1. 3 Production, Example 7. Production, Example 9. 5 The compound is purified on A110: before rocrystallizing.

What is claimed is:

l. A 6H-dibenz[b,e]thiepin derivative selected from the group consisting of bases and their acid addition salts, said bases being compounds of the formula:

6 CH S wherein R is a member selected from the group consisting of halogen, lower alkyl, lower alkoxy and lower alkylthio, and R is a member selected from the group consisting of piperidino ethyl, pyrrolidino ethyl, morpholino ethyl, 2-(piperidino)-llower alkyl ethyl.

3. A 6H-dibenz[b,e]thiepin derivative selected from the group consisting of bases and their acid addition salts, said bases being compounds of the fonnula:

wherein R is a member selected from the group consisting of halogen, lower alkoxy and lower alkylthio, and R is lower dialkylamino ethyl,

4. 2-methyl-l l-[ l -methyl-piperidylidene-(4 ]-6H- dibenz[b,e]thiepin 2-chloro-l l-[ l -methyl-piperidylidene-(4 ]-6H- dibenz[b,e]thiepin.

6. 2-chloro-l l-[ l'-dimethylaminopropylidene-( 3)]-6H- dibenz[b,e]thiepin.

7. 2chloro-1 l-[ l '-piperidinopropylidene-(3')]-6l-ldibenz[2b,e]thie in.

8. methyl io-l l-[ l '-d1methylaminopropylidene-( 3 ]-6 H-dibenz[b,e]thiepin.

9. 2-methylthio-l l-[ l '-methyl-piperidylidene-(4' ]-6H- dibenz[b,e]thiepin.

l0. Z-methoxy-l l-[ l '-dimethylaminopropylidene 3')]-6H- dibenz[b,e]thiepin.

ll. 2-methoxy-l l-[ l '-methyl-piperidylidene-( 4' ]-6H- dibenz[b,e]thiepin.

l2. 2chloro-l l[1'-piperidino-2'-methyl-propylidene-( 3 

2. A 6H-dibenz(b,e)thiepin derivative selected from the group consisting of bases and their acid addition salts, said bases being compounds of the formula:
 3. A 6H-dibenz(b,e)thiepin derivative selected from the group consisting of bases and their acid addition salts, said bases being compounds of the formula:
 4. 2-methyl-11-(1''-methyl-piperidylidene-(4''))-6H-dibenz(b, e)thiepin.
 5. 2-chloro-11-(1''-methyl-piperidylidene-(4''))-6H-dibenz(b, e)thiepin.
 6. 2-chloro-11-(1''-dimethylaminopropylidene-(3''))-6H-dibenz(b, e)thiepin.
 7. 2chloro-11-(1''-piperidinopropylidene-(3''))-6H-dibenz(b, e)thiepin.
 8. 2methylthio-11-(1''-dimethylaminopropylidene-(3''))-6H-dibenz(b,e)thiepin.
 9. 2-methylthio-11-(1''-methyl-piperidylidene-(4''))-6H-dibenz(b, e)thiepin.
 10. 2-methoxy-11-(1''-dimethylaminopropylidene-(3''))-6H-dibenz(b, e)thiepin.
 11. 2-methoxy-11-(1''-methyl-piperidylidene-(4''))-6H-dibenz(b, e)thiepin.
 12. 2chloro-11(1''-piperidino-2''-methyl-propylidene-(3''))-6H-dibenz(b,e)thiepin.
 13. 2-methylthio-11-(1''-morpholino-2''-methyl-propylidene-(3''))-6H -dibenz(b,e)thiepin.
 14. 2methoxy- 11- Beta -(1''methyl-piperidyl-(2'')-ethylidene) -6H-dibenz(b,e)thiepin.
 15. 2-chloro-11- Beta -(1''-methyl-pyrrolidyl-(2'')-ethylidene) -6H-dibenz(b,e)thiepin.
 16. 2-chloro-11-(1''-methyl-piperidyl-(3'')-methylidene)-6H-dibenz(b,e)thiepin. 